{"gene":"JUNB","run_date":"2026-06-10T01:55:23","timeline":{"discoveries":[{"year":1993,"finding":"JunB has ~10-fold lower DNA-binding activity than c-Jun due to a small number of amino acid differences in its DNA-binding and dimerization domains. Substituting four amino acids in JunB's DNA-binding/dimerization motifs with the corresponding c-Jun sequences converts JunB into a c-Jun-like activator. JunB attenuates c-Jun trans-activation via its leucine zipper; two glycine residues in the JunB leucine zipper decrease zipper stability, reducing homodimerization and increasing heterodimerization with c-Jun to form inactive heterodimers.","method":"Domain-swap mutagenesis, transactivation reporter assays, dimerization analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct mutagenesis with functional reconstitution, multiple orthogonal methods in a single rigorous study","pmids":["8383624"],"is_preprint":false},{"year":1993,"finding":"The NFAT-1 DNA-binding complex in activated T cells contains JunB and Fra-1 as its inducible nuclear AP-1 component, binding a variant AP-1 site at the 3' end of the NFAT-1 sequence. Mutation of this AP-1 site inhibits both NFAT-1 binding and NFAT-1-driven reporter expression. Antibody supershift experiments identified JunB and Fra-1 specifically within the complex.","method":"EMSA supershift with AP-1 family-specific antibodies, site-directed mutation of AP-1 site, reporter assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reciprocal antibody supershift, AP-1 site mutation, and reporter assay in a single study","pmids":["8441422"],"is_preprint":false},{"year":1999,"finding":"JunB is selectively induced in Th2 (not Th1) cells during differentiation and binds directly to the P1 AP-1 site of the IL-4 promoter, synergizing with c-Maf to activate IL-4 transcription. This synergy requires phosphorylation of JunB at Thr102 and Thr104 by JNK MAP kinase, which facilitates cooperative DNA binding between JunB and c-Maf. Elevated JunB in transgenic mice increased Th2 cytokine expression in developing Th1 cells.","method":"EMSA, reporter gene assay, site-directed mutagenesis (Thr102/104), JNK kinase assay, transgenic mouse overexpression","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct DNA binding, mutagenesis of phosphorylation sites, in vivo transgenic validation, multiple orthogonal methods","pmids":["9889198"],"is_preprint":false},{"year":1999,"finding":"JunB-deficient embryos die between E8.5–E10.0 due to failure to establish proper vascular interactions with maternal circulation. In trophoblasts, loss of JunB causes deregulation of proliferin, MMP-9, and uPA expression, resulting in defective decidual neovascularization. Downregulation of VEGF-receptor 1 (flt-1) leads to dilated yolk sac vessels. Tetraploid rescue (injection of junB−/− ES cells into WT blastocysts) rescued fetal growth retardation and placental labyrinth defects.","method":"Genetic knockout (junB−/− mice), gene expression analysis of trophoblast targets, tetraploid blastocyst complementation rescue","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout with defined molecular targets and genetic rescue experiment","pmids":["10022836"],"is_preprint":false},{"year":2000,"finding":"JunB directly activates transcription of the cyclin-dependent kinase inhibitor p16(INK4a) through three AP-1-like binding sites in the p16 promoter. Increased JunB expression induces premature senescence in primary cells and reduces proliferation in 3T3 cells by abolishing cyclin D-associated kinase activity and reducing pRb hyperphosphorylation. The anti-proliferative effect of JunB is p16-dependent (absent in INK4a−/− cells).","method":"Gain/loss-of-function in mouse fibroblasts, p16 promoter reporter and deletion analysis, cyclin D kinase assay, pRb phosphorylation assay, INK4a−/− epistasis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct promoter binding, mutagenesis-validated AP-1 sites, kinase assays, genetic epistasis with INK4a-null cells","pmids":["10856241"],"is_preprint":false},{"year":2001,"finding":"JunB (and c-Jun) interact physically with Smad3 off-DNA, reducing Smad3/DNA interactions and thereby suppressing TGF-β/Smad3-driven transcription. Conversely, junB−/− fibroblasts show significantly higher Smad-specific promoter transactivation, and rescue of junB expression normalizes this. Thus, TGF-β-induced JunB expression constitutes a negative feedback loop on early Smad-driven gene activation.","method":"Co-immunoprecipitation (Smad3–JunB interaction), reporter assay in junB−/− vs. wild-type MEFs, JunB rescue experiment","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP of Smad3–JunB, genetic loss-of-function with rescue, but single lab","pmids":["11402315"],"is_preprint":false},{"year":2002,"finding":"JunB can functionally substitute for c-Jun during mouse development in a gene-dosage-dependent manner when knocked into the Jun locus. JunB rescues Jun/Fos-regulated gene expression but not Jun/ATF-regulated gene expression, thereby rescuing liver and cardiac defects of Jun-null mice in vivo and in primary fibroblasts and fetal hepatoblasts in vitro.","method":"Knock-in strategy, transgenic complementation, gene expression analysis of Jun/Fos vs Jun/ATF targets","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic knock-in with defined transcriptional target specificity, replicated in multiple cell types","pmids":["11818961"],"is_preprint":false},{"year":2002,"finding":"JunB directly activates cyclin A transcription by binding to the CRE element in the cyclin A promoter, driving G2/M cell cycle progression. junB−/− fibroblasts show impaired cyclin A-CDK2 and cyclin B-CDC2 kinase activities and accumulate in S-phase. Re-introduction of inducible JunB-ER(TM) restores cyclin A expression and normal cell cycle distribution.","method":"junB−/− fibroblasts, cyclin A promoter reporter (CRE binding), kinase activity assays, inducible JunB rescue","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct promoter binding with CRE element, kinase assays, genetic rescue; single lab but multiple orthogonal methods","pmids":["12121977"],"is_preprint":false},{"year":2004,"finding":"Conditional deletion of JunB in osteoblasts and osteoclasts reveals cell-autonomous roles: mutant osteoblasts show elevated p16(INK4a) but decreased cyclin D1 and cyclin A, reduced osteocalcin and bone sialoprotein, and transiently increased Runx2; macrophage-lineage-specific JunB deletion causes osteopetrosis-like phenotype with reduced osteoclast numbers, indicating JunB is a positive regulator of osteoclast activity.","method":"Conditional (Cre-lox) knockout in osteoblast and macrophage-osteoclast lineages, in vivo and in vitro differentiation assays, gene expression analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional knockouts with defined molecular and cellular phenotypes in multiple lineages","pmids":["14769860"],"is_preprint":false},{"year":2006,"finding":"During cardiac ischemia-reperfusion (I/R) injury, JunB and FosB accumulate in nuclei of cardiomyocytes, fibroblasts, and endothelial cells. ChIP of the MMP-2 promoter AP-1 site shows JunB homodimers occupying it under control conditions, switching to JunB/FosB heterodimers after I/R, driving enhanced MMP-2 transcription and translation. This induction is blocked by the hydroxyl radical scavenger MPG, implicating oxidant stress.","method":"Chromatin immunoprecipitation (ChIP) of AP-1 site in MMP-2 promoter, immunohistochemistry, real-time PCR, Western blot, pharmacological inhibition","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP of endogenous promoter with dimer composition analysis, single lab","pmids":["16699069"],"is_preprint":false},{"year":2007,"finding":"In NPM-ALK-positive ALCL, ERK1/2 activation downstream of NPM-ALK transcriptionally upregulates JUNB mRNA, while active mTOR pathway promotes JUNB mRNA translation (shifting it from monosomes/RNPs to large polysomes). JunB knockdown decreases proliferation; mTOR inhibition downregulates JunB protein by shifting its mRNA to monosomes/RNPs.","method":"NPM-ALK expression, pharmacological ERK/mTOR inhibition, siRNA/shRNA knockdown, polysome fractionation, cell cycle analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — polysome fractionation distinguishes transcriptional vs. translational control, genetic knockdown; single lab","pmids":["17690253"],"is_preprint":false},{"year":2008,"finding":"JunB directly represses G-CSF (Csf3) transcription in epidermal keratinocytes. Loss of epidermal JunB causes elevated systemic G-CSF, leading to myeloproliferative disease and low bone mass. Genetic ablation of G-CSF in JunB epidermal-KO mice prevents myeloproliferative disease but not bone loss, establishing G-CSF as a direct JunB transcriptional target mediating skin-to-hematopoietic organ signaling.","method":"Epidermal-specific conditional JunB knockout, G-CSF genetic rescue (double mutant), in vitro keratinocyte analysis, promoter studies","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO, genetic epistasis with G-CSF null, defined direct transcriptional target with in vivo rescue","pmids":["18641637"],"is_preprint":false},{"year":2010,"finding":"JunB directly activates transcription of myosin regulatory light chain 9 (Myl9), which controls actomyosin contractility and stress fiber assembly. Conditional ablation of Junb impairs arterial contractility, stress fiber formation, and cellular motility in VSMCs, MEFs, and endothelial cells. Re-expression of either Junb or Myl9 in Junb-deficient cells restores stress fiber formation, motility, and contractile capacity.","method":"Conditional Junb knockout in vascular cells, Myl9 rescue experiment, vascular contractility assays, stress fiber imaging, ChIP/promoter analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — conditional KO, genetic rescue with Myl9, direct transcriptional target identification, multiple orthogonal assays","pmids":["20551518"],"is_preprint":false},{"year":2010,"finding":"JunB overexpression induces skeletal muscle hypertrophy independently of the Akt/mTOR pathway and prevents denervation atrophy. JunB blocks FoxO3 binding to the atrogin-1 and MuRF-1 promoters, thereby reducing protein breakdown. RNAi-mediated JunB knockdown in adult muscles causes atrophy; nuclear exclusion of JunB is observed in atrophying myotubes.","method":"Electroporation-based OE/KD in adult mouse muscles, ChIP (FoxO3 binding to atrogin-1/MuRF-1 promoters), protein synthesis measurement, denervation model","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo loss- and gain-of-function, ChIP of FoxO3 at target promoters, Akt/mTOR epistasis; multiple orthogonal methods","pmids":["20921137"],"is_preprint":false},{"year":2010,"finding":"Smurf1 ubiquitin E3 ligase interacts with JunB through its PY motif, ubiquitinates JunB, and targets it for proteasomal degradation. Smurf1-deficient mesenchymal stem cells have elevated JunB protein, increased cyclin D1 (a JunB transcriptional target), and enhanced proliferation and osteoblast differentiation. JunB knockdown in Smurf1−/− cells restores osteogenic potential to wild-type level.","method":"Co-immunoprecipitation, ubiquitination assay, cyclin D1 promoter reporter, JunB knockdown rescue in Smurf1−/− cells","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — biochemical reconstitution of ubiquitination, co-IP of interaction, promoter assay, genetic rescue; multiple methods","pmids":["20200942"],"is_preprint":false},{"year":2012,"finding":"JunB undergoes phosphorylation-dependent ubiquitylation during the G2 phase of the cell cycle. GSK3 phosphorylates a consensus phospho-degron on JunB, and the E3 ubiquitin ligase SCF(FBXW7) mediates JunB ubiquitylation and degradation in G2. Inactivation of this GSK3-FBXW7-JunB axis causes JunB accumulation in G2/M, transcriptional repression of the DNA helicase DDX11, and premature sister chromatid separation.","method":"Phospho-degron mutagenesis, co-immunoprecipitation with GSK3/FBXW7, ubiquitylation assay, pharmacological/genetic GSK3 inhibition, chromatid cohesion assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — phospho-degron mutagenesis, co-IP with E3 ligase components, functional chromatid cohesion readout; multiple methods","pmids":["22710716"],"is_preprint":false},{"year":2012,"finding":"JunB is required for TGF-β-induced epithelial-mesenchymal transition (EMT). JunB depletion by siRNA abrogates TGF-β-induced disruption of cell-cell junctions, actin fiber formation, focal adhesions, and expression of fibrotic proteins. JunB contributes to Smad-mediated repression of inhibitor of differentiation 2 (Id2) through interaction with transcriptional repressor ATF3, and mediates TGF-β induction of fibronectin, fibulin-2, tropomyosin (Tpm1), and integrin-β3.","method":"siRNA knockdown, co-immunoprecipitation (JunB–ATF3), ChIP, actin/junction immunofluorescence, reporter assay","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — siRNA with multiple phenotypic readouts, co-IP of JunB–ATF3; single lab","pmids":["22391036"],"is_preprint":false},{"year":2013,"finding":"JUNB in NK and NKT cells directly activates Ifng transcription (IFN-γ is a direct transcriptional target of JUNB). Targeted deletion of Junb in immune cells decreases IFN-γ expression and secretion from NK/NKT cells, reducing STAT1 pathway activation and protecting against concanavalin A-induced hepatitis. Systemic IFN-γ treatment or adenoviral IRF1 delivery restores hepatotoxicity in Junb-deficient mice.","method":"Conditional immune-cell Junb knockout, ChIP (JUNB at Ifng promoter), cytokine ELISA, STAT1 activation assay, IFN-γ rescue experiment","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in immune cells, ChIP of direct target, genetic/cytokine rescue; multiple orthogonal methods","pmids":["24200694"],"is_preprint":false},{"year":2014,"finding":"JunB is required for full LPS-induced expression of Il1b and other pro-inflammatory genes in macrophages, and also modulates alternative macrophage activation markers induced by IL-4. Junb knockdown in macrophages reduces both classical (M1) and alternative (M2) activation gene expression.","method":"siRNA knockdown in macrophages, LPS/IL-4 stimulation, gene expression analysis, network modeling validation","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — knockdown with defined gene expression phenotypes, single lab; validated computationally predicted interaction","pmids":["25472994"],"is_preprint":false},{"year":2014,"finding":"JUNB loss-of-function in prostate epithelium combined with Pten loss promotes invasive cancer. JunB deficiency leads to decreased p16(Ink4a) and p21(CIP1) in epithelial cells, increased proliferation, and decreased senescence. Tumor stroma shows increased osteopontin and S100A8/9 expression.","method":"Prostate epithelium-specific conditional Junb/Pten double knockout, topical Cre delivery, histology, immunostaining for senescence/proliferation markers","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional double KO with defined molecular phenotype; single lab","pmids":["25526087"],"is_preprint":false},{"year":2016,"finding":"Itch is a HECT-type neddylation E3 ligase that neddylates JunB, attenuating its transcriptional activity. Itch-mediated neddylation of JunB also promotes its ubiquitination-dependent proteasomal degradation.","method":"Neddylation assay in cells, co-immunoprecipitation (Itch–JunB), reporter assay of JunB transcriptional activity, ubiquitination assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — biochemical neddylation and ubiquitination assays, co-IP; single lab","pmids":["27245101"],"is_preprint":false},{"year":2017,"finding":"JunB is required for Th17 cell identity: it directly activates expression of RORγt and RORα (Th17 lineage-specifying receptors) and represses Foxp3. JunB forms a heterodimer with BATF to activate Th17 signature genes; JunB facilitates BATF DNA binding at the Rorc locus. JunB expression is induced by IL-6, is required for IL-23 receptor expression and IL-23-dependent pathogenic Th17 differentiation, but is dispensable for TGF-β1-dependent non-pathogenic Th17 cells.","method":"Conditional Junb-deficient T cells, ATAC-seq/ChIP-seq (BATF binding at Rorc locus), RNA-seq, EAE and colitis models, cytokine stimulation (IL-6, IL-23, TGF-β1)","journal":"Nature communications / Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in multiple disease models, genome-wide ChIP-seq of BATF binding, replicated across two independent labs (PMIDs 28824171 and 28555647 and 29234109)","pmids":["28824171","28555647","29234109"],"is_preprint":false},{"year":2018,"finding":"JunB in effector Treg cells promotes an IRF4-dependent transcriptional program by facilitating the accumulation of IRF4 at a subset of its target sites, including loci near Icos and Ctla4. JunB promotes Treg effector molecule expression (ICOS, CTLA4) in BATF-dependent and BATF-independent manners. Mice lacking JunB in Treg cells develop multi-organ autoimmunity.","method":"Treg-specific Junb conditional KO, ChIP-seq (IRF4 binding at Icos/Ctla4 loci with/without JunB), flow cytometry, in vitro Treg differentiation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO, ChIP-seq of IRF4 occupancy as mechanistic readout, autoimmunity phenotype; multiple methods","pmids":["30559442"],"is_preprint":false},{"year":2018,"finding":"USP38 is a deubiquitinase that directly associates with JunB, removes Lys-48-linked poly-ubiquitin chains from JunB, and thereby blocks TCR-induced JunB proteasomal turnover. USP38 is required for TCR-induced JunB protein stabilization, Th2 cytokine production, and Th2 development in vitro and in vivo.","method":"Co-immunoprecipitation (USP38–JunB), deubiquitination assay (K48-specific), USP38 KO mice, Th2 differentiation assay, OVA/HDM asthma model","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — biochemical deubiquitination assay, co-IP, KO mouse with disease model; multiple orthogonal methods","pmids":["30224386"],"is_preprint":false},{"year":2018,"finding":"JUNB governs a TGFβ feed-forward regulatory network in breast cancer: prolonged TGFβ stimulation alters the genome-wide SMAD2/3 binding landscape and induces JUNB expression; JUNB is required for expression of late invasion-mediating genes, including WNT7A and WNT7B. WNT7A/7B overexpression enhances TGFβ-induced invasion, while WNT pathway inhibition reduces it.","method":"ChIP-seq (SMAD2/3 binding), siRNA knockdown of JUNB, de novo motif analysis, invasion assays, WNT pathway manipulation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-seq and functional knockdown; single lab","pmids":["29186616"],"is_preprint":false},{"year":2021,"finding":"Persistent JunB activation in fibroblasts drives senescence through concomitant upregulation of p16INK4A and repression of IGF-1. This fibroblast senescence disrupts the stem cell niche, depleting skin stem cell pools. Fibroblast-specific JunB silencing restores IGF-1 and p16 levels and rescues skin stem cell pools and tissue integrity.","method":"Fibroblast-specific JunB overexpression/silencing in vivo, p16/IGF-1 expression analysis, skin stem cell quantification, niche interaction assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional OE and KD with defined molecular (p16, IGF-1) and stem cell phenotypes; single lab","pmids":["34469740"],"is_preprint":false},{"year":2021,"finding":"JunB directly activates FBXO21 promoter expression in chondrocytes. The JUNB-FBXO21-ERK axis promotes cartilage degeneration in osteoarthritis: FBXO21 inhibits autophagy by interacting with and phosphorylating ERK. JUNB knockdown reduces FBXO21 expression and attenuates OA-related cartilage degeneration.","method":"ChIP (JunB at FBXO21 promoter), co-immunoprecipitation (FBXO21–ERK), mass spectrometry, siRNA knockdown, in vivo OA model","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP of direct promoter binding, co-IP/MS for downstream interaction; single lab","pmids":["33450132"],"is_preprint":false},{"year":2021,"finding":"JUNB is an essential regulator of hemogenic endothelium specialization and endothelial-to-hematopoietic transition during human hematopoiesis in vitro, as identified by integrative chromatin accessibility (ATAC-seq), H3K4me3/H3K27me3 ChIP-seq, and transcriptomic profiling with JUNB loss-of-function.","method":"ATAC-seq, H3K4me3/H3K27me3 ChIP-seq, RNA-seq, single-cell analysis, JUNB loss-of-function during hPSC-to-HPC differentiation","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multi-omics integration with loss-of-function; single lab","pmids":["35668082"],"is_preprint":false},{"year":2022,"finding":"JUNB promotes cell cycle progression by inducing cyclin E1 expression and repressing TGF-β2 gene transcription. High JUNB levels switch TGF-β2 stimulation from an anti-proliferative to a pro-invasive response and promote TGF-β2 mRNA translation. These functions were established by combined transcriptomic, genomic, and functional studies.","method":"Transcriptomics, ChIP-seq, siRNA/overexpression, cyclin E1 promoter reporter, polysome profiling, in vivo xenograft/metastasis model","journal":"Genome biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genomic and functional methods; single lab","pmids":["36494864"],"is_preprint":false},{"year":2022,"finding":"m6A methylation by METTL3 regulates JUNB expression at the level of mRNA stability (not translation): specific m6A motifs in the JUNB 3'UTR are recognized by distinct m6A reader proteins that control JUNB mRNA stability during TGF-β-induced EMT. JUNB knockdown impairs expression of specific mesenchymal target genes during EMT.","method":"METTL3 KD, m6A site mutagenesis in 3'UTR, m6A reader protein knockdown, RNA stability assays, siRNA knockdown of JUNB","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — m6A motif mutagenesis, reader protein co-IP, RNA stability measurements; single lab","pmids":["36183833"],"is_preprint":false},{"year":2004,"finding":"JunB cooperates with the transcriptional coactivator p300 to activate DMP1 (dentin matrix protein 1) transcription during osteoblast differentiation. Phosphorylation of JunB at Ser-79 is required for its interaction with p300. Immunoprecipitation and ChIP confirmed the in vivo interaction of JunB and p300 at the DMP1 promoter.","method":"Co-immunoprecipitation (JunB–p300), ChIP, Ser-79 phospho-mutant, DMP1 promoter reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ChIP, phospho-site mutagenesis; single lab","pmids":["15308641"],"is_preprint":false},{"year":2014,"finding":"JunB stimulates XBP1 expression via the transcription factor C/EBPδ during ER stress, and this JunB–XBP1 axis activates AKT signaling. JunB silencing inhibits AKT activation and activates the pro-apoptotic Bcl-2 protein BAD via dephosphorylation; forced XBP1s expression rescues viability of JunB-deficient β-cells. XBP1 knockdown also reduces AKT phosphorylation, linking JunB to AKT through XBP1.","method":"siRNA knockdown (JunB, XBP1), adenoviral overexpression, BAD phosphorylation assay, AKT phosphorylation assay, C/EBPδ reporter assay, GLP-1 agonist treatment","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pathway epistasis experiments with defined molecular readouts; single lab","pmids":["24786832"],"is_preprint":false},{"year":2019,"finding":"JunB plays a crucial role in Treg cell development by facilitating IL-2 production and CD25 (high-affinity IL-2 receptor subunit) expression in CD4+ T cells. Junb-deficient CD4+ T cells fail to differentiate into Treg cells in vitro unless exogenous IL-2 is supplied; a cell-intrinsic defect confirmed by mixed bone marrow transfer. IL-2/anti-IL-2 complex injection rescued Treg expansion and alleviated DSS colitis in Junbfl/flCd4-Cre mice.","method":"Conditional Junb KO (Cd4-Cre), in vitro Treg differentiation ±IL-2, mixed bone marrow chimera, IL-2 complex rescue, DSS colitis model","journal":"Mucosal immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with cell-intrinsic epistasis via chimera and cytokine rescue; single lab","pmids":["31285535"],"is_preprint":false},{"year":2022,"finding":"JunB directly inhibits expression of apoptosis-promoting genes, including Bcl2l11 (encoding Bim), in T helper cells by promoting IRF4 DNA binding at the Bcl2l11 locus. JunB is required for clonal expansion of Th1, Th2, and Th17 cells; TCR-stimulated Junb-deficient CD4+ T cells are more sensitive to apoptosis.","method":"Conditional Junb KO, flow cytometry (apoptosis, proliferation), ChIP (IRF4 at Bcl2l11 locus in the presence/absence of JunB), immunization models","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO, ChIP of IRF4 occupancy at direct target; single lab","pmids":["35837408"],"is_preprint":false},{"year":2012,"finding":"CARMA1 deficiency reduces JunB protein stability by enhancing its ubiquitination and degradation, impairing TCR-induced Th2 cytokine production and differentiation. JunB stability is regulated downstream of CARMA1 signaling.","method":"CARMA1-deficient T cells, ubiquitination assay of JunB, JunB protein stability measurement, Th2 differentiation assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ubiquitination assay, KO with defined JunB stability phenotype; single lab","pmids":["22371397"],"is_preprint":false},{"year":2023,"finding":"Bmal1 (core circadian clock gene) directly regulates Junb transcription in macrophages, controlling diurnal variation in ConA-induced hepatitis. JunB in macrophages promotes inflammation by regulating AKT and ERK signaling pathways. Macrophage-specific Junb knockdown blunts the time-of-day-dependent effect of ConA-induced liver injury.","method":"Myeloid-specific Bmal1 and Junb conditional KO/KD, ChIP (Bmal1 at Junb promoter), AKT/ERK signaling assays, ConA hepatitis model","journal":"JHEP reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KOs, ChIP of direct transcriptional regulation, defined signaling pathway; single lab","pmids":["37791375"],"is_preprint":false},{"year":2023,"finding":"VCAM-1 regulates JunB-mediated IL-8 promoter activity and expression in human retinal endothelial cells. JunB-driven IL-8/CXCL1 signaling downstream of VCAM-1 controls retinal endothelial cell sprouting and pathological neovascularization. Intravitreal VCAM-1 siRNA decreases VCAM-1–JunB–CXCL1 signaling and reduces OIR-induced retinal neovascularization.","method":"siRNA knockdown (VCAM-1, JunB), IL-8 promoter reporter assay, RNA-seq, intravitreal siRNA injection, OIR mouse model","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — promoter reporter, in vitro and in vivo knockdown with angiogenesis readout; single lab","pmids":["37179352"],"is_preprint":false},{"year":2024,"finding":"NAT10-mediated ac4C modification of JUNB mRNA increases its expression in TNBC. JunB then upregulates LDHA transcription, promoting glycolysis and immunosuppression. Loss of NAT10 inhibits JunB expression and TNBC tumor progression; the combination of NAT10 inhibitor remodelin and CTLA-4 antibody synergistically activates T cells.","method":"NAT10 KO/overexpression, ac4C sequencing, ChIP/reporter for JunB-driven LDHA, in vitro and in vivo tumor models, T cell functional assays","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ac4C sequencing, ChIP, in vivo xenograft; single lab","pmids":["39363363"],"is_preprint":false},{"year":2024,"finding":"MEK inhibition prevents CAR-T cell exhaustion and terminal differentiation by downregulating c-Fos and JunB. Overexpression of JunB in CAR-T cells counteracts MEK inhibition effects. Cut-and-Tag assay shows that MEK inhibition reduces JunB-driven gene programs associated with exhaustion, differentiation, anergy, glycolysis, and apoptosis in CAR-T cells.","method":"MEKi treatment, JunB/c-Fos overexpression in CAR-T cells, Cut-and-Tag (JunB ChIP-seq), single-cell transcriptomics, tumor efficacy assays","journal":"Signal transduction and targeted therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Cut-and-Tag for JunB genome-wide binding, rescue by JunB overexpression; single lab","pmids":["39438476"],"is_preprint":false}],"current_model":"JunB is an AP-1 transcription factor that dimerizes (as homodimers or heterodimers with Fos/Jun/ATF family members) with intrinsically lower DNA-binding affinity than c-Jun due to specific leucine zipper and DNA-binding domain residues; it directly activates or represses target genes including p16(INK4a), cyclin A, cyclin E1, G-CSF, IFN-γ, IL-4, MMP-2, Myl9, FBXO21, and DDX11, and is itself regulated post-translationally by phosphorylation (JNK at Thr102/104; GSK3 phospho-degron), ubiquitination/degradation (SCF-FBXW7, Smurf1), deubiquitination (USP38), neddylation (Itch), and m6A-dependent mRNA stability (METTL3), collectively controlling cell proliferation, senescence, muscle mass, T helper cell fate (Th2/Th17/Treg), vascular contractility and angiogenesis, osteoblast/osteoclast activity, and inflammatory responses."},"narrative":{"mechanistic_narrative":"JUNB is an AP-1 transcription factor that controls cell proliferation, senescence, and lineage-specific gene programs by binding AP-1 and AP-1-like elements as homodimers or heterodimers with Fos, Jun, and ATF/BATF family members [PMID:8383624, PMID:8441422]. Relative to c-Jun, JunB has roughly 10-fold lower DNA-binding activity, attributable to a small number of residues in its DNA-binding and leucine-zipper domains; two destabilizing glycines in its zipper favor inactive heterodimers with c-Jun, so JunB can attenuate c-Jun-driven transcription [PMID:8383624]. It enforces cell-cycle and senescence control by directly activating the CDK inhibitor p16(INK4a) to trigger premature senescence [PMID:10856241], yet also driving proliferation through direct activation of cyclin A and cyclin E1, with loss causing S-phase accumulation and impaired CDK activity [PMID:12121977, PMID:36494864]; this proliferative/senescence balance underlies its tumor-suppressive role in prostate epithelium and its senescence-driven depletion of skin stem cell niches [PMID:25526087, PMID:34469740]. A GSK3-primed phospho-degron targets JunB for SCF(FBXW7)-mediated degradation in G2, and disrupting this axis causes premature sister-chromatid separation via repression of the helicase DDX11 [PMID:22710716]. JunB is a master regulator of adaptive and innate immunity, directing T helper fate by activating IL-4 with c-Maf in Th2 cells [PMID:9889198], specifying Th17 identity through BATF heterodimerization and activation of RORγt/RORα while repressing Foxp3 [PMID:28824171, PMID:28555647, PMID:29234109], supporting Treg effector programs via IRF4 [PMID:30559442, PMID:31285535], and protecting T cells from apoptosis by promoting IRF4 occupancy at Bcl2l11 [PMID:35837408]. It is essential for vascular and developmental processes, with knockout embryos dying from defective placental vascularization [PMID:10022836], and directly activating Myl9 to control actomyosin contractility [PMID:20551518]. JunB additionally governs muscle mass by blocking FoxO3-driven atrogene transcription [PMID:20921137], and acts in TGF-β/Smad signaling both as a feedback repressor of Smad3 and as a driver of EMT and invasion [PMID:11402315, PMID:22391036, PMID:29186616]. Its abundance is set by an extensive post-translational and post-transcriptional network including ubiquitination by Smurf1, neddylation by Itch, deubiquitination by USP38, and m6A/ac4C-dependent mRNA regulation by METTL3 and NAT10 [PMID:20200942, PMID:27245101, PMID:30224386, PMID:36183833, PMID:39363363].","teleology":[{"year":1993,"claim":"Established the molecular basis for JunB's weak transactivation relative to c-Jun, explaining how it can act as a dampener of AP-1 activity.","evidence":"Domain-swap mutagenesis, transactivation reporter, and dimerization analysis defining DNA-binding and leucine-zipper residue differences","pmids":["8383624"],"confidence":"High","gaps":["Did not resolve which endogenous heterodimer partners predominate in specific cell types","Structural basis of zipper destabilization not solved at atomic resolution"]},{"year":1993,"claim":"Identified JunB as an inducible AP-1 component of the NFAT-1 complex in activated T cells, linking it to T-cell transcriptional programs.","evidence":"EMSA supershift with AP-1-specific antibodies, AP-1 site mutation, reporter assay","pmids":["8441422"],"confidence":"High","gaps":["Did not establish downstream T-cell genes controlled by this complex","Functional consequence of JunB/Fra-1 versus other dimers at NFAT sites unaddressed"]},{"year":1999,"claim":"Defined JunB as a Th2-selective activator of IL-4 acting cooperatively with c-Maf, and tied this to JNK phosphorylation of JunB.","evidence":"EMSA, reporter assay, Thr102/104 phospho-mutagenesis, JNK kinase assay, transgenic overexpression","pmids":["9889198"],"confidence":"High","gaps":["Did not define the structural mechanism by which phosphorylation enables cooperative DNA binding","Other Th2 target genes not enumerated"]},{"year":1999,"claim":"Demonstrated that JunB is essential for placental and embryonic vascularization, defining trophoblast target genes through which it acts.","evidence":"junB-null mice, trophoblast gene expression analysis, tetraploid blastocyst rescue","pmids":["10022836"],"confidence":"High","gaps":["Direct versus indirect regulation of proliferin/MMP-9/uPA/flt-1 not fully resolved","Cell-autonomous mechanism in each vascular cell type undefined"]},{"year":2000,"claim":"Showed JunB directly activates p16(INK4a) to induce senescence, establishing it as an anti-proliferative AP-1 factor.","evidence":"Gain/loss of function in fibroblasts, p16 promoter reporter/deletion, cyclin D kinase assay, INK4a-null epistasis","pmids":["10856241"],"confidence":"High","gaps":["How the same factor toggles between senescence and proliferation outputs not mechanistically resolved here"]},{"year":2002,"claim":"Resolved the in vivo specificity of JunB by showing it can substitute for c-Jun at Jun/Fos but not Jun/ATF target genes.","evidence":"Jun-locus knock-in, transgenic complementation, target-class gene expression","pmids":["11818961"],"confidence":"High","gaps":["Molecular basis for selective rescue of Jun/Fos versus Jun/ATF targets not pinned to specific residues"]},{"year":2002,"claim":"Established a pro-proliferative arm of JunB via direct activation of cyclin A at a CRE element, driving G2/M progression.","evidence":"junB-null fibroblasts, cyclin A CRE promoter reporter, CDK assays, inducible JunB rescue","pmids":["12121977"],"confidence":"High","gaps":["Reconciliation with JunB's senescence-promoting role left open","Context determining activation versus repression of cell-cycle genes undefined"]},{"year":2004,"claim":"Revealed cell-autonomous roles of JunB in both osteoblasts and osteoclasts, linking it to bone homeostasis.","evidence":"Lineage-specific conditional knockouts, differentiation assays, gene expression analysis","pmids":["14769860"],"confidence":"High","gaps":["Direct target genes in osteoclast lineage not defined","Mechanism of opposing effects in two lineages unresolved"]},{"year":2004,"claim":"Identified phosphorylation-dependent coactivator recruitment, showing Ser-79 phosphorylation enables JunB-p300 cooperation at the DMP1 promoter.","evidence":"Co-IP, ChIP, Ser-79 phospho-mutant, DMP1 reporter","pmids":["15308641"],"confidence":"Medium","gaps":["Kinase responsible for Ser-79 phosphorylation not identified","Single lab; reciprocal validation of p300 interaction limited"]},{"year":2001,"claim":"Placed JunB in a TGF-β negative feedback loop by showing it binds Smad3 off-DNA to limit Smad-driven transcription.","evidence":"Smad3-JunB co-IP, reporter assays in junB-null versus WT MEFs with rescue","pmids":["11402315"],"confidence":"Medium","gaps":["Single lab; reciprocal/structural validation of the Smad3 interaction lacking","Later work shows context-dependent pro-EMT role, leaving the dual function partly unreconciled"]},{"year":2006,"claim":"Showed dimer-composition switching (JunB homodimer to JunB/FosB) at the MMP-2 promoter drives oxidant-stress-induced transcription during cardiac I/R injury.","evidence":"ChIP of endogenous MMP-2 AP-1 site, IHC, qPCR, radical-scavenger inhibition","pmids":["16699069"],"confidence":"Medium","gaps":["Single lab; functional consequence of dimer switch on cardiac outcome correlative","Signal linking oxidant stress to FosB induction not defined"]},{"year":2007,"claim":"Demonstrated dual transcriptional and translational control of JUNB downstream of NPM-ALK via ERK and mTOR in ALCL.","evidence":"NPM-ALK expression, ERK/mTOR inhibition, knockdown, polysome fractionation","pmids":["17690253"],"confidence":"Medium","gaps":["Single lab; direct ERK/mTOR effectors on the JUNB locus/mRNA not identified","Generalizability beyond ALCL untested here"]},{"year":2008,"claim":"Defined JunB as a direct repressor of G-CSF in keratinocytes mediating skin-to-bone-marrow signaling, with genetic epistasis confirming the target.","evidence":"Epidermal-specific conditional KO, G-CSF double-mutant rescue, promoter studies","pmids":["18641637"],"confidence":"High","gaps":["Bone loss phenotype is G-CSF-independent, leaving its mediator undefined"]},{"year":2010,"claim":"Identified Myl9 as a direct JunB target controlling actomyosin contractility, motility, and arterial function.","evidence":"Conditional KO in vascular cells, Myl9 rescue, contractility/stress-fiber assays, ChIP","pmids":["20551518"],"confidence":"High","gaps":["Additional cytoskeletal targets not mapped genome-wide here"]},{"year":2010,"claim":"Established JunB as a regulator of muscle mass that opposes FoxO3-driven atrogene transcription independently of Akt/mTOR.","evidence":"In vivo muscle electroporation OE/KD, ChIP of FoxO3 at atrogin-1/MuRF-1, protein synthesis, denervation model","pmids":["20921137"],"confidence":"High","gaps":["Mechanism by which JunB blocks FoxO3 promoter binding (competition versus complex) not resolved"]},{"year":2010,"claim":"Identified Smurf1 as an E3 ligase that destabilizes JunB, coupling JunB turnover to mesenchymal proliferation and osteoblast differentiation.","evidence":"Co-IP via PY motif, ubiquitination assay, cyclin D1 reporter, knockdown rescue in Smurf1-null cells","pmids":["20200942"],"confidence":"High","gaps":["Signals controlling Smurf1-JunB engagement in vivo not defined"]},{"year":2012,"claim":"Defined a GSK3-FBXW7 phospho-degron controlling JunB degradation in G2 and linked its failure to chromosome cohesion defects via DDX11 repression.","evidence":"Phospho-degron mutagenesis, co-IP with GSK3/FBXW7, ubiquitylation assay, chromatid cohesion readout","pmids":["22710716"],"confidence":"High","gaps":["Whether JunB-DDX11 repression contributes to genomic instability in cancer not tested in vivo"]},{"year":2012,"claim":"Showed JunB stability is controlled downstream of CARMA1 signaling, linking TCR signaling to JunB-dependent Th2 differentiation.","evidence":"CARMA1-deficient T cells, JunB ubiquitination/stability assays, Th2 differentiation","pmids":["22371397"],"confidence":"Medium","gaps":["Single lab; the E3 ligase acting downstream of CARMA1 not identified"]},{"year":2012,"claim":"Implicated JunB in TGF-β-induced EMT, including Smad-mediated Id2 repression via ATF3 and induction of mesenchymal/fibrotic genes.","evidence":"siRNA, JunB-ATF3 co-IP, ChIP, junction/actin imaging, reporter","pmids":["22391036"],"confidence":"Medium","gaps":["Single lab; direct versus indirect target assignment for each mesenchymal gene incomplete"]},{"year":2013,"claim":"Established IFN-γ (Ifng) as a direct JUNB target in NK/NKT cells driving STAT1-dependent hepatitis.","evidence":"Conditional immune KO, ChIP at Ifng promoter, cytokine ELISA, IFN-γ/IRF1 rescue","pmids":["24200694"],"confidence":"High","gaps":["Dimer partner controlling Ifng activation in NK/NKT cells not specified"]},{"year":2014,"claim":"Linked JunB to ER-stress survival signaling by showing it activates XBP1 via C/EBPδ to sustain AKT and suppress BAD-driven apoptosis in β-cells.","evidence":"siRNA/overexpression, BAD and AKT phosphorylation assays, C/EBPδ reporter, XBP1s rescue","pmids":["24786832"],"confidence":"Medium","gaps":["Single lab; directness of JunB regulation of the XBP1 axis not fully resolved"]},{"year":2014,"claim":"Showed JunB is required for both classical and alternative macrophage activation programs.","evidence":"siRNA knockdown in macrophages, LPS/IL-4 stimulation, expression profiling with network modeling","pmids":["25472994"],"confidence":"Medium","gaps":["Single lab; direct macrophage target genes not defined by ChIP"]},{"year":2014,"claim":"Defined a tumor-suppressive role for JunB in prostate, where its loss reduces p16/p21 and senescence to cooperate with Pten loss in invasive cancer.","evidence":"Prostate-specific Junb/Pten double KO, histology, senescence/proliferation immunostaining","pmids":["25526087"],"confidence":"Medium","gaps":["Single lab; mechanism of stromal osteopontin/S100A8/9 induction not resolved"]},{"year":2017,"claim":"Established JunB as essential for Th17 identity through BATF heterodimerization, RORγt/RORα activation, and Foxp3 repression, with replication across labs.","evidence":"Conditional Junb T cells, ATAC-seq/ChIP-seq of BATF at Rorc, RNA-seq, EAE/colitis models","pmids":["28824171","28555647","29234109"],"confidence":"High","gaps":["Distinction between pathogenic versus non-pathogenic Th17 control only partly mechanistically explained"]},{"year":2018,"claim":"Showed JunB enables effector Treg programs by facilitating IRF4 chromatin occupancy at Icos/Ctla4 loci, preventing autoimmunity.","evidence":"Treg-specific KO, IRF4 ChIP-seq with/without JunB, flow cytometry","pmids":["30559442"],"confidence":"High","gaps":["BATF-independent arm of JunB action not mechanistically defined"]},{"year":2018,"claim":"Identified USP38 as a deubiquitinase stabilizing JunB downstream of TCR signaling to support Th2 development.","evidence":"USP38-JunB co-IP, K48-specific deubiquitination assay, USP38 KO mice, asthma models","pmids":["30224386"],"confidence":"High","gaps":["Counteracting E3 ligase for TCR-induced JunB turnover not identified here"]},{"year":2018,"claim":"Placed JUNB in a TGF-β feed-forward network driving late invasion genes WNT7A/7B in breast cancer.","evidence":"SMAD2/3 ChIP-seq, JUNB knockdown, motif analysis, invasion assays, WNT manipulation","pmids":["29186616"],"confidence":"Medium","gaps":["Single lab; direct JUNB binding at WNT7A/7B loci not fully established"]},{"year":2019,"claim":"Demonstrated JunB is required for Treg development by enabling IL-2 production and CD25 expression, with a cell-intrinsic defect rescuable by IL-2.","evidence":"Cd4-Cre conditional KO, in vitro Treg ±IL-2, mixed bone marrow chimera, IL-2 complex rescue, DSS colitis","pmids":["31285535"],"confidence":"Medium","gaps":["Single lab; direct target through which JunB controls IL-2/CD25 not defined"]},{"year":2021,"claim":"Showed persistent JunB drives fibroblast senescence (p16 up, IGF-1 down) that depletes skin stem cell niches.","evidence":"Fibroblast-specific OE/silencing in vivo, p16/IGF-1 analysis, stem cell quantification","pmids":["34469740"],"confidence":"Medium","gaps":["Single lab; directness of IGF-1 repression by JunB not fully established"]},{"year":2021,"claim":"Defined a JUNB-FBXO21-ERK axis in chondrocytes that inhibits autophagy and promotes osteoarthritic cartilage degeneration.","evidence":"ChIP of JunB at FBXO21 promoter, FBXO21-ERK co-IP/MS, siRNA, OA model","pmids":["33450132"],"confidence":"Medium","gaps":["Single lab; mechanism by which FBXO21 phosphorylates ERK requires deeper validation"]},{"year":2021,"claim":"Identified JUNB as essential for hemogenic endothelium specialization and endothelial-to-hematopoietic transition in human hematopoiesis.","evidence":"ATAC-seq, H3K4me3/H3K27me3 ChIP-seq, RNA-seq, single-cell analysis with JUNB loss-of-function","pmids":["35668082"],"confidence":"Medium","gaps":["Single lab; direct JUNB target genes driving the transition not pinpointed"]},{"year":2022,"claim":"Showed JUNB promotes cell-cycle progression via cyclin E1 induction and switches TGF-β2 from anti-proliferative to pro-invasive output.","evidence":"Transcriptomics, ChIP-seq, cyclin E1 reporter, polysome profiling, xenograft/metastasis","pmids":["36494864"],"confidence":"Medium","gaps":["Single lab; threshold mechanism for the TGF-β2 response switch undefined"]},{"year":2022,"claim":"Established m6A control of JUNB mRNA stability by METTL3 and 3'UTR reader proteins during TGF-β-induced EMT.","evidence":"METTL3 KD, 3'UTR m6A site mutagenesis, reader knockdown, RNA stability assays","pmids":["36183833"],"confidence":"Medium","gaps":["Single lab; identity and division of labor among readers only partly resolved"]},{"year":2022,"claim":"Showed JunB protects T helper cells from apoptosis by promoting IRF4 binding at Bcl2l11 and is required for clonal expansion.","evidence":"Conditional KO, apoptosis/proliferation flow cytometry, IRF4 ChIP at Bcl2l11, immunization","pmids":["35837408"],"confidence":"Medium","gaps":["Single lab; how JunB enhances IRF4 occupancy mechanistically unresolved"]},{"year":2023,"claim":"Linked the circadian clock to JunB by showing Bmal1 directly drives Junb transcription to gate diurnal macrophage inflammation.","evidence":"Myeloid Bmal1/Junb conditional KO/KD, Bmal1 ChIP at Junb promoter, AKT/ERK assays, ConA hepatitis","pmids":["37791375"],"confidence":"Medium","gaps":["Single lab; direct macrophage targets of JunB in this circuit undefined"]},{"year":2023,"claim":"Defined a VCAM-1-JunB-IL-8/CXCL1 axis controlling retinal endothelial sprouting and pathological neovascularization.","evidence":"siRNA, IL-8 promoter reporter, RNA-seq, intravitreal siRNA, OIR model","pmids":["37179352"],"confidence":"Medium","gaps":["Single lab; signaling connecting VCAM-1 to JunB activation not detailed"]},{"year":2024,"claim":"Showed NAT10-mediated ac4C of JUNB mRNA elevates JunB, which activates LDHA to promote glycolysis and immunosuppression in TNBC.","evidence":"NAT10 KO/OE, ac4C-seq, ChIP/reporter for LDHA, in vivo tumor models, T-cell assays","pmids":["39363363"],"confidence":"Medium","gaps":["Single lab; relative contribution of ac4C versus other JunB regulation in TNBC unclear"]},{"year":2024,"claim":"Demonstrated that MEK-driven JunB programs promote CAR-T exhaustion, and that JunB overexpression reverses the protective effect of MEK inhibition.","evidence":"MEKi, JunB/c-Fos overexpression, JunB Cut-and-Tag, single-cell transcriptomics, tumor efficacy","pmids":["39438476"],"confidence":"Medium","gaps":["Single lab; specific exhaustion target genes mediating the effect not isolated"]},{"year":null,"claim":"How JunB's dimer partner identity and post-translational state are integrated to dictate its opposing outputs (proliferation versus senescence, activation versus repression, pro- versus anti-inflammatory) within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking dimer composition, phosphorylation, and degradation to context-specific gene selection","Structural basis of partner-dependent target choice not solved","Genome-wide direct target maps across cell types not integrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,4,7,11,12,13,17,21,28]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,2,4,7]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,13]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[1,4]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,4,7,11,17,21]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2,17,21,22,32,33]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4,7,15,28]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,16,24,31,35]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[4,25,31]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[14,15,20,23]}],"complexes":["AP-1 transcription factor"],"partners":["FOS","JUN","MAF","BATF","ATF3","SMAD3","IRF4","EP300"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P17275","full_name":"Transcription factor JunB","aliases":["Transcription factor AP-1 subunit JunB"],"length_aa":347,"mass_kda":35.9,"function":"Transcription factor involved in regulating gene activity following the primary growth factor response. Binds to the DNA sequence 5'-TGA[GC]TCA-3'. Heterodimerizes with proteins of the FOS family to form an AP-1 transcription complex, thereby enhancing its DNA binding activity to an AP-1 consensus sequence and its transcriptional activity (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P17275/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/JUNB","classification":"Not Classified","n_dependent_lines":248,"n_total_lines":1208,"dependency_fraction":0.2052980132450331},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000171223","cell_line_id":"CID001659","localizations":[{"compartment":"chromatin","grade":3},{"compartment":"nucleoplasm","grade":2}],"interactors":[{"gene":"BATF3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001659","total_profiled":1310},"omim":[{"mim_id":"620868","title":"AT-RICH INTERACTION DOMAIN-CONTAINING PROTEIN 3C; ARID3C","url":"https://www.omim.org/entry/620868"},{"mim_id":"618322","title":"UBIQUITIN-SPECIFIC PROTEASE 38; USP38","url":"https://www.omim.org/entry/618322"},{"mim_id":"612476","title":"BASIC LEUCINE ZIPPER TRANSCRIPTION FACTOR, ATF-LIKE; BATF","url":"https://www.omim.org/entry/612476"},{"mim_id":"608657","title":"JUN DIMERIZATION PROTEIN 2; JDP2","url":"https://www.omim.org/entry/608657"},{"mim_id":"606409","title":"ITCHY E3 UBIQUITIN PROTEIN LIGASE; ITCH","url":"https://www.omim.org/entry/606409"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"blood vessel","ntpm":1053.5}],"url":"https://www.proteinatlas.org/search/JUNB"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P17275","domains":[{"cath_id":"1.20.5","chopping":"266-334","consensus_level":"medium","plddt":97.002,"start":266,"end":334}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P17275","model_url":"https://alphafold.ebi.ac.uk/files/AF-P17275-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P17275-F1-predicted_aligned_error_v6.png","plddt_mean":59.53},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=JUNB","jax_strain_url":"https://www.jax.org/strain/search?query=JUNB"},"sequence":{"accession":"P17275","fasta_url":"https://rest.uniprot.org/uniprotkb/P17275.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P17275/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P17275"}},"corpus_meta":[{"pmid":"8383624","id":"PMC_8383624","title":"JunB differs from c-Jun in its DNA-binding and dimerization domains, and represses c-Jun by formation of inactive heterodimers.","date":"1993","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/8383624","citation_count":309,"is_preprint":false},{"pmid":"9889198","id":"PMC_9889198","title":"Regulation of IL-4 expression by the transcription factor JunB during T helper cell differentiation.","date":"1999","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/9889198","citation_count":302,"is_preprint":false},{"pmid":"10856241","id":"PMC_10856241","title":"JunB suppresses cell proliferation by transcriptional activation of p16(INK4a) expression.","date":"2000","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/10856241","citation_count":268,"is_preprint":false},{"pmid":"8441422","id":"PMC_8441422","title":"The NFAT-1 DNA binding complex in activated T cells contains Fra-1 and JunB.","date":"1993","source":"Molecular and cellular 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N-methyl-D-aspartate receptors.","date":"1994","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/8078918","citation_count":176,"is_preprint":false},{"pmid":"14769860","id":"PMC_14769860","title":"Mice lacking JunB are osteopenic due to cell-autonomous osteoblast and osteoclast defects.","date":"2004","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/14769860","citation_count":172,"is_preprint":false},{"pmid":"1705005","id":"PMC_1705005","title":"Interleukin-6 signals activating junB and TIS11 gene transcription in a B-cell hybridoma.","date":"1991","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/1705005","citation_count":164,"is_preprint":false},{"pmid":"1924349","id":"PMC_1924349","title":"Overexpression of c-jun, junB, or junD affects cell growth differently.","date":"1991","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/1924349","citation_count":156,"is_preprint":false},{"pmid":"1719551","id":"PMC_1719551","title":"cAMP-dependent regulation of proenkephalin by JunD and JunB: positive and negative effects of AP-1 proteins.","date":"1991","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/1719551","citation_count":153,"is_preprint":false},{"pmid":"12393503","id":"PMC_12393503","title":"Amplification and overexpression of JUNB is associated with primary cutaneous T-cell lymphomas.","date":"2002","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/12393503","citation_count":139,"is_preprint":false},{"pmid":"11818961","id":"PMC_11818961","title":"JunB can substitute for Jun in mouse development and cell proliferation.","date":"2002","source":"Nature 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Substituting four amino acids in JunB's DNA-binding/dimerization motifs with the corresponding c-Jun sequences converts JunB into a c-Jun-like activator. JunB attenuates c-Jun trans-activation via its leucine zipper; two glycine residues in the JunB leucine zipper decrease zipper stability, reducing homodimerization and increasing heterodimerization with c-Jun to form inactive heterodimers.\",\n      \"method\": \"Domain-swap mutagenesis, transactivation reporter assays, dimerization analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct mutagenesis with functional reconstitution, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"8383624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The NFAT-1 DNA-binding complex in activated T cells contains JunB and Fra-1 as its inducible nuclear AP-1 component, binding a variant AP-1 site at the 3' end of the NFAT-1 sequence. Mutation of this AP-1 site inhibits both NFAT-1 binding and NFAT-1-driven reporter expression. Antibody supershift experiments identified JunB and Fra-1 specifically within the complex.\",\n      \"method\": \"EMSA supershift with AP-1 family-specific antibodies, site-directed mutation of AP-1 site, reporter assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reciprocal antibody supershift, AP-1 site mutation, and reporter assay in a single study\",\n      \"pmids\": [\"8441422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"JunB is selectively induced in Th2 (not Th1) cells during differentiation and binds directly to the P1 AP-1 site of the IL-4 promoter, synergizing with c-Maf to activate IL-4 transcription. This synergy requires phosphorylation of JunB at Thr102 and Thr104 by JNK MAP kinase, which facilitates cooperative DNA binding between JunB and c-Maf. Elevated JunB in transgenic mice increased Th2 cytokine expression in developing Th1 cells.\",\n      \"method\": \"EMSA, reporter gene assay, site-directed mutagenesis (Thr102/104), JNK kinase assay, transgenic mouse overexpression\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct DNA binding, mutagenesis of phosphorylation sites, in vivo transgenic validation, multiple orthogonal methods\",\n      \"pmids\": [\"9889198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"JunB-deficient embryos die between E8.5–E10.0 due to failure to establish proper vascular interactions with maternal circulation. In trophoblasts, loss of JunB causes deregulation of proliferin, MMP-9, and uPA expression, resulting in defective decidual neovascularization. Downregulation of VEGF-receptor 1 (flt-1) leads to dilated yolk sac vessels. Tetraploid rescue (injection of junB−/− ES cells into WT blastocysts) rescued fetal growth retardation and placental labyrinth defects.\",\n      \"method\": \"Genetic knockout (junB−/− mice), gene expression analysis of trophoblast targets, tetraploid blastocyst complementation rescue\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout with defined molecular targets and genetic rescue experiment\",\n      \"pmids\": [\"10022836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"JunB directly activates transcription of the cyclin-dependent kinase inhibitor p16(INK4a) through three AP-1-like binding sites in the p16 promoter. Increased JunB expression induces premature senescence in primary cells and reduces proliferation in 3T3 cells by abolishing cyclin D-associated kinase activity and reducing pRb hyperphosphorylation. The anti-proliferative effect of JunB is p16-dependent (absent in INK4a−/− cells).\",\n      \"method\": \"Gain/loss-of-function in mouse fibroblasts, p16 promoter reporter and deletion analysis, cyclin D kinase assay, pRb phosphorylation assay, INK4a−/− epistasis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct promoter binding, mutagenesis-validated AP-1 sites, kinase assays, genetic epistasis with INK4a-null cells\",\n      \"pmids\": [\"10856241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"JunB (and c-Jun) interact physically with Smad3 off-DNA, reducing Smad3/DNA interactions and thereby suppressing TGF-β/Smad3-driven transcription. Conversely, junB−/− fibroblasts show significantly higher Smad-specific promoter transactivation, and rescue of junB expression normalizes this. Thus, TGF-β-induced JunB expression constitutes a negative feedback loop on early Smad-driven gene activation.\",\n      \"method\": \"Co-immunoprecipitation (Smad3–JunB interaction), reporter assay in junB−/− vs. wild-type MEFs, JunB rescue experiment\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP of Smad3–JunB, genetic loss-of-function with rescue, but single lab\",\n      \"pmids\": [\"11402315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"JunB can functionally substitute for c-Jun during mouse development in a gene-dosage-dependent manner when knocked into the Jun locus. JunB rescues Jun/Fos-regulated gene expression but not Jun/ATF-regulated gene expression, thereby rescuing liver and cardiac defects of Jun-null mice in vivo and in primary fibroblasts and fetal hepatoblasts in vitro.\",\n      \"method\": \"Knock-in strategy, transgenic complementation, gene expression analysis of Jun/Fos vs Jun/ATF targets\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic knock-in with defined transcriptional target specificity, replicated in multiple cell types\",\n      \"pmids\": [\"11818961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"JunB directly activates cyclin A transcription by binding to the CRE element in the cyclin A promoter, driving G2/M cell cycle progression. junB−/− fibroblasts show impaired cyclin A-CDK2 and cyclin B-CDC2 kinase activities and accumulate in S-phase. Re-introduction of inducible JunB-ER(TM) restores cyclin A expression and normal cell cycle distribution.\",\n      \"method\": \"junB−/− fibroblasts, cyclin A promoter reporter (CRE binding), kinase activity assays, inducible JunB rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct promoter binding with CRE element, kinase assays, genetic rescue; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"12121977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Conditional deletion of JunB in osteoblasts and osteoclasts reveals cell-autonomous roles: mutant osteoblasts show elevated p16(INK4a) but decreased cyclin D1 and cyclin A, reduced osteocalcin and bone sialoprotein, and transiently increased Runx2; macrophage-lineage-specific JunB deletion causes osteopetrosis-like phenotype with reduced osteoclast numbers, indicating JunB is a positive regulator of osteoclast activity.\",\n      \"method\": \"Conditional (Cre-lox) knockout in osteoblast and macrophage-osteoclast lineages, in vivo and in vitro differentiation assays, gene expression analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional knockouts with defined molecular and cellular phenotypes in multiple lineages\",\n      \"pmids\": [\"14769860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"During cardiac ischemia-reperfusion (I/R) injury, JunB and FosB accumulate in nuclei of cardiomyocytes, fibroblasts, and endothelial cells. ChIP of the MMP-2 promoter AP-1 site shows JunB homodimers occupying it under control conditions, switching to JunB/FosB heterodimers after I/R, driving enhanced MMP-2 transcription and translation. This induction is blocked by the hydroxyl radical scavenger MPG, implicating oxidant stress.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) of AP-1 site in MMP-2 promoter, immunohistochemistry, real-time PCR, Western blot, pharmacological inhibition\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP of endogenous promoter with dimer composition analysis, single lab\",\n      \"pmids\": [\"16699069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In NPM-ALK-positive ALCL, ERK1/2 activation downstream of NPM-ALK transcriptionally upregulates JUNB mRNA, while active mTOR pathway promotes JUNB mRNA translation (shifting it from monosomes/RNPs to large polysomes). JunB knockdown decreases proliferation; mTOR inhibition downregulates JunB protein by shifting its mRNA to monosomes/RNPs.\",\n      \"method\": \"NPM-ALK expression, pharmacological ERK/mTOR inhibition, siRNA/shRNA knockdown, polysome fractionation, cell cycle analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — polysome fractionation distinguishes transcriptional vs. translational control, genetic knockdown; single lab\",\n      \"pmids\": [\"17690253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"JunB directly represses G-CSF (Csf3) transcription in epidermal keratinocytes. Loss of epidermal JunB causes elevated systemic G-CSF, leading to myeloproliferative disease and low bone mass. Genetic ablation of G-CSF in JunB epidermal-KO mice prevents myeloproliferative disease but not bone loss, establishing G-CSF as a direct JunB transcriptional target mediating skin-to-hematopoietic organ signaling.\",\n      \"method\": \"Epidermal-specific conditional JunB knockout, G-CSF genetic rescue (double mutant), in vitro keratinocyte analysis, promoter studies\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO, genetic epistasis with G-CSF null, defined direct transcriptional target with in vivo rescue\",\n      \"pmids\": [\"18641637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"JunB directly activates transcription of myosin regulatory light chain 9 (Myl9), which controls actomyosin contractility and stress fiber assembly. Conditional ablation of Junb impairs arterial contractility, stress fiber formation, and cellular motility in VSMCs, MEFs, and endothelial cells. Re-expression of either Junb or Myl9 in Junb-deficient cells restores stress fiber formation, motility, and contractile capacity.\",\n      \"method\": \"Conditional Junb knockout in vascular cells, Myl9 rescue experiment, vascular contractility assays, stress fiber imaging, ChIP/promoter analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — conditional KO, genetic rescue with Myl9, direct transcriptional target identification, multiple orthogonal assays\",\n      \"pmids\": [\"20551518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"JunB overexpression induces skeletal muscle hypertrophy independently of the Akt/mTOR pathway and prevents denervation atrophy. JunB blocks FoxO3 binding to the atrogin-1 and MuRF-1 promoters, thereby reducing protein breakdown. RNAi-mediated JunB knockdown in adult muscles causes atrophy; nuclear exclusion of JunB is observed in atrophying myotubes.\",\n      \"method\": \"Electroporation-based OE/KD in adult mouse muscles, ChIP (FoxO3 binding to atrogin-1/MuRF-1 promoters), protein synthesis measurement, denervation model\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo loss- and gain-of-function, ChIP of FoxO3 at target promoters, Akt/mTOR epistasis; multiple orthogonal methods\",\n      \"pmids\": [\"20921137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Smurf1 ubiquitin E3 ligase interacts with JunB through its PY motif, ubiquitinates JunB, and targets it for proteasomal degradation. Smurf1-deficient mesenchymal stem cells have elevated JunB protein, increased cyclin D1 (a JunB transcriptional target), and enhanced proliferation and osteoblast differentiation. JunB knockdown in Smurf1−/− cells restores osteogenic potential to wild-type level.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, cyclin D1 promoter reporter, JunB knockdown rescue in Smurf1−/− cells\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — biochemical reconstitution of ubiquitination, co-IP of interaction, promoter assay, genetic rescue; multiple methods\",\n      \"pmids\": [\"20200942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"JunB undergoes phosphorylation-dependent ubiquitylation during the G2 phase of the cell cycle. GSK3 phosphorylates a consensus phospho-degron on JunB, and the E3 ubiquitin ligase SCF(FBXW7) mediates JunB ubiquitylation and degradation in G2. Inactivation of this GSK3-FBXW7-JunB axis causes JunB accumulation in G2/M, transcriptional repression of the DNA helicase DDX11, and premature sister chromatid separation.\",\n      \"method\": \"Phospho-degron mutagenesis, co-immunoprecipitation with GSK3/FBXW7, ubiquitylation assay, pharmacological/genetic GSK3 inhibition, chromatid cohesion assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — phospho-degron mutagenesis, co-IP with E3 ligase components, functional chromatid cohesion readout; multiple methods\",\n      \"pmids\": [\"22710716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"JunB is required for TGF-β-induced epithelial-mesenchymal transition (EMT). JunB depletion by siRNA abrogates TGF-β-induced disruption of cell-cell junctions, actin fiber formation, focal adhesions, and expression of fibrotic proteins. JunB contributes to Smad-mediated repression of inhibitor of differentiation 2 (Id2) through interaction with transcriptional repressor ATF3, and mediates TGF-β induction of fibronectin, fibulin-2, tropomyosin (Tpm1), and integrin-β3.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation (JunB–ATF3), ChIP, actin/junction immunofluorescence, reporter assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — siRNA with multiple phenotypic readouts, co-IP of JunB–ATF3; single lab\",\n      \"pmids\": [\"22391036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"JUNB in NK and NKT cells directly activates Ifng transcription (IFN-γ is a direct transcriptional target of JUNB). Targeted deletion of Junb in immune cells decreases IFN-γ expression and secretion from NK/NKT cells, reducing STAT1 pathway activation and protecting against concanavalin A-induced hepatitis. Systemic IFN-γ treatment or adenoviral IRF1 delivery restores hepatotoxicity in Junb-deficient mice.\",\n      \"method\": \"Conditional immune-cell Junb knockout, ChIP (JUNB at Ifng promoter), cytokine ELISA, STAT1 activation assay, IFN-γ rescue experiment\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in immune cells, ChIP of direct target, genetic/cytokine rescue; multiple orthogonal methods\",\n      \"pmids\": [\"24200694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"JunB is required for full LPS-induced expression of Il1b and other pro-inflammatory genes in macrophages, and also modulates alternative macrophage activation markers induced by IL-4. Junb knockdown in macrophages reduces both classical (M1) and alternative (M2) activation gene expression.\",\n      \"method\": \"siRNA knockdown in macrophages, LPS/IL-4 stimulation, gene expression analysis, network modeling validation\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — knockdown with defined gene expression phenotypes, single lab; validated computationally predicted interaction\",\n      \"pmids\": [\"25472994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"JUNB loss-of-function in prostate epithelium combined with Pten loss promotes invasive cancer. JunB deficiency leads to decreased p16(Ink4a) and p21(CIP1) in epithelial cells, increased proliferation, and decreased senescence. Tumor stroma shows increased osteopontin and S100A8/9 expression.\",\n      \"method\": \"Prostate epithelium-specific conditional Junb/Pten double knockout, topical Cre delivery, histology, immunostaining for senescence/proliferation markers\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional double KO with defined molecular phenotype; single lab\",\n      \"pmids\": [\"25526087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Itch is a HECT-type neddylation E3 ligase that neddylates JunB, attenuating its transcriptional activity. Itch-mediated neddylation of JunB also promotes its ubiquitination-dependent proteasomal degradation.\",\n      \"method\": \"Neddylation assay in cells, co-immunoprecipitation (Itch–JunB), reporter assay of JunB transcriptional activity, ubiquitination assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — biochemical neddylation and ubiquitination assays, co-IP; single lab\",\n      \"pmids\": [\"27245101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"JunB is required for Th17 cell identity: it directly activates expression of RORγt and RORα (Th17 lineage-specifying receptors) and represses Foxp3. JunB forms a heterodimer with BATF to activate Th17 signature genes; JunB facilitates BATF DNA binding at the Rorc locus. JunB expression is induced by IL-6, is required for IL-23 receptor expression and IL-23-dependent pathogenic Th17 differentiation, but is dispensable for TGF-β1-dependent non-pathogenic Th17 cells.\",\n      \"method\": \"Conditional Junb-deficient T cells, ATAC-seq/ChIP-seq (BATF binding at Rorc locus), RNA-seq, EAE and colitis models, cytokine stimulation (IL-6, IL-23, TGF-β1)\",\n      \"journal\": \"Nature communications / Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in multiple disease models, genome-wide ChIP-seq of BATF binding, replicated across two independent labs (PMIDs 28824171 and 28555647 and 29234109)\",\n      \"pmids\": [\"28824171\", \"28555647\", \"29234109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"JunB in effector Treg cells promotes an IRF4-dependent transcriptional program by facilitating the accumulation of IRF4 at a subset of its target sites, including loci near Icos and Ctla4. JunB promotes Treg effector molecule expression (ICOS, CTLA4) in BATF-dependent and BATF-independent manners. Mice lacking JunB in Treg cells develop multi-organ autoimmunity.\",\n      \"method\": \"Treg-specific Junb conditional KO, ChIP-seq (IRF4 binding at Icos/Ctla4 loci with/without JunB), flow cytometry, in vitro Treg differentiation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO, ChIP-seq of IRF4 occupancy as mechanistic readout, autoimmunity phenotype; multiple methods\",\n      \"pmids\": [\"30559442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP38 is a deubiquitinase that directly associates with JunB, removes Lys-48-linked poly-ubiquitin chains from JunB, and thereby blocks TCR-induced JunB proteasomal turnover. USP38 is required for TCR-induced JunB protein stabilization, Th2 cytokine production, and Th2 development in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation (USP38–JunB), deubiquitination assay (K48-specific), USP38 KO mice, Th2 differentiation assay, OVA/HDM asthma model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — biochemical deubiquitination assay, co-IP, KO mouse with disease model; multiple orthogonal methods\",\n      \"pmids\": [\"30224386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"JUNB governs a TGFβ feed-forward regulatory network in breast cancer: prolonged TGFβ stimulation alters the genome-wide SMAD2/3 binding landscape and induces JUNB expression; JUNB is required for expression of late invasion-mediating genes, including WNT7A and WNT7B. WNT7A/7B overexpression enhances TGFβ-induced invasion, while WNT pathway inhibition reduces it.\",\n      \"method\": \"ChIP-seq (SMAD2/3 binding), siRNA knockdown of JUNB, de novo motif analysis, invasion assays, WNT pathway manipulation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-seq and functional knockdown; single lab\",\n      \"pmids\": [\"29186616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Persistent JunB activation in fibroblasts drives senescence through concomitant upregulation of p16INK4A and repression of IGF-1. This fibroblast senescence disrupts the stem cell niche, depleting skin stem cell pools. Fibroblast-specific JunB silencing restores IGF-1 and p16 levels and rescues skin stem cell pools and tissue integrity.\",\n      \"method\": \"Fibroblast-specific JunB overexpression/silencing in vivo, p16/IGF-1 expression analysis, skin stem cell quantification, niche interaction assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional OE and KD with defined molecular (p16, IGF-1) and stem cell phenotypes; single lab\",\n      \"pmids\": [\"34469740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"JunB directly activates FBXO21 promoter expression in chondrocytes. The JUNB-FBXO21-ERK axis promotes cartilage degeneration in osteoarthritis: FBXO21 inhibits autophagy by interacting with and phosphorylating ERK. JUNB knockdown reduces FBXO21 expression and attenuates OA-related cartilage degeneration.\",\n      \"method\": \"ChIP (JunB at FBXO21 promoter), co-immunoprecipitation (FBXO21–ERK), mass spectrometry, siRNA knockdown, in vivo OA model\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP of direct promoter binding, co-IP/MS for downstream interaction; single lab\",\n      \"pmids\": [\"33450132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"JUNB is an essential regulator of hemogenic endothelium specialization and endothelial-to-hematopoietic transition during human hematopoiesis in vitro, as identified by integrative chromatin accessibility (ATAC-seq), H3K4me3/H3K27me3 ChIP-seq, and transcriptomic profiling with JUNB loss-of-function.\",\n      \"method\": \"ATAC-seq, H3K4me3/H3K27me3 ChIP-seq, RNA-seq, single-cell analysis, JUNB loss-of-function during hPSC-to-HPC differentiation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multi-omics integration with loss-of-function; single lab\",\n      \"pmids\": [\"35668082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"JUNB promotes cell cycle progression by inducing cyclin E1 expression and repressing TGF-β2 gene transcription. High JUNB levels switch TGF-β2 stimulation from an anti-proliferative to a pro-invasive response and promote TGF-β2 mRNA translation. These functions were established by combined transcriptomic, genomic, and functional studies.\",\n      \"method\": \"Transcriptomics, ChIP-seq, siRNA/overexpression, cyclin E1 promoter reporter, polysome profiling, in vivo xenograft/metastasis model\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genomic and functional methods; single lab\",\n      \"pmids\": [\"36494864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"m6A methylation by METTL3 regulates JUNB expression at the level of mRNA stability (not translation): specific m6A motifs in the JUNB 3'UTR are recognized by distinct m6A reader proteins that control JUNB mRNA stability during TGF-β-induced EMT. JUNB knockdown impairs expression of specific mesenchymal target genes during EMT.\",\n      \"method\": \"METTL3 KD, m6A site mutagenesis in 3'UTR, m6A reader protein knockdown, RNA stability assays, siRNA knockdown of JUNB\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — m6A motif mutagenesis, reader protein co-IP, RNA stability measurements; single lab\",\n      \"pmids\": [\"36183833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"JunB cooperates with the transcriptional coactivator p300 to activate DMP1 (dentin matrix protein 1) transcription during osteoblast differentiation. Phosphorylation of JunB at Ser-79 is required for its interaction with p300. Immunoprecipitation and ChIP confirmed the in vivo interaction of JunB and p300 at the DMP1 promoter.\",\n      \"method\": \"Co-immunoprecipitation (JunB–p300), ChIP, Ser-79 phospho-mutant, DMP1 promoter reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ChIP, phospho-site mutagenesis; single lab\",\n      \"pmids\": [\"15308641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"JunB stimulates XBP1 expression via the transcription factor C/EBPδ during ER stress, and this JunB–XBP1 axis activates AKT signaling. JunB silencing inhibits AKT activation and activates the pro-apoptotic Bcl-2 protein BAD via dephosphorylation; forced XBP1s expression rescues viability of JunB-deficient β-cells. XBP1 knockdown also reduces AKT phosphorylation, linking JunB to AKT through XBP1.\",\n      \"method\": \"siRNA knockdown (JunB, XBP1), adenoviral overexpression, BAD phosphorylation assay, AKT phosphorylation assay, C/EBPδ reporter assay, GLP-1 agonist treatment\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pathway epistasis experiments with defined molecular readouts; single lab\",\n      \"pmids\": [\"24786832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"JunB plays a crucial role in Treg cell development by facilitating IL-2 production and CD25 (high-affinity IL-2 receptor subunit) expression in CD4+ T cells. Junb-deficient CD4+ T cells fail to differentiate into Treg cells in vitro unless exogenous IL-2 is supplied; a cell-intrinsic defect confirmed by mixed bone marrow transfer. IL-2/anti-IL-2 complex injection rescued Treg expansion and alleviated DSS colitis in Junbfl/flCd4-Cre mice.\",\n      \"method\": \"Conditional Junb KO (Cd4-Cre), in vitro Treg differentiation ±IL-2, mixed bone marrow chimera, IL-2 complex rescue, DSS colitis model\",\n      \"journal\": \"Mucosal immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with cell-intrinsic epistasis via chimera and cytokine rescue; single lab\",\n      \"pmids\": [\"31285535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"JunB directly inhibits expression of apoptosis-promoting genes, including Bcl2l11 (encoding Bim), in T helper cells by promoting IRF4 DNA binding at the Bcl2l11 locus. JunB is required for clonal expansion of Th1, Th2, and Th17 cells; TCR-stimulated Junb-deficient CD4+ T cells are more sensitive to apoptosis.\",\n      \"method\": \"Conditional Junb KO, flow cytometry (apoptosis, proliferation), ChIP (IRF4 at Bcl2l11 locus in the presence/absence of JunB), immunization models\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO, ChIP of IRF4 occupancy at direct target; single lab\",\n      \"pmids\": [\"35837408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CARMA1 deficiency reduces JunB protein stability by enhancing its ubiquitination and degradation, impairing TCR-induced Th2 cytokine production and differentiation. JunB stability is regulated downstream of CARMA1 signaling.\",\n      \"method\": \"CARMA1-deficient T cells, ubiquitination assay of JunB, JunB protein stability measurement, Th2 differentiation assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ubiquitination assay, KO with defined JunB stability phenotype; single lab\",\n      \"pmids\": [\"22371397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Bmal1 (core circadian clock gene) directly regulates Junb transcription in macrophages, controlling diurnal variation in ConA-induced hepatitis. JunB in macrophages promotes inflammation by regulating AKT and ERK signaling pathways. Macrophage-specific Junb knockdown blunts the time-of-day-dependent effect of ConA-induced liver injury.\",\n      \"method\": \"Myeloid-specific Bmal1 and Junb conditional KO/KD, ChIP (Bmal1 at Junb promoter), AKT/ERK signaling assays, ConA hepatitis model\",\n      \"journal\": \"JHEP reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KOs, ChIP of direct transcriptional regulation, defined signaling pathway; single lab\",\n      \"pmids\": [\"37791375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VCAM-1 regulates JunB-mediated IL-8 promoter activity and expression in human retinal endothelial cells. JunB-driven IL-8/CXCL1 signaling downstream of VCAM-1 controls retinal endothelial cell sprouting and pathological neovascularization. Intravitreal VCAM-1 siRNA decreases VCAM-1–JunB–CXCL1 signaling and reduces OIR-induced retinal neovascularization.\",\n      \"method\": \"siRNA knockdown (VCAM-1, JunB), IL-8 promoter reporter assay, RNA-seq, intravitreal siRNA injection, OIR mouse model\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — promoter reporter, in vitro and in vivo knockdown with angiogenesis readout; single lab\",\n      \"pmids\": [\"37179352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NAT10-mediated ac4C modification of JUNB mRNA increases its expression in TNBC. JunB then upregulates LDHA transcription, promoting glycolysis and immunosuppression. Loss of NAT10 inhibits JunB expression and TNBC tumor progression; the combination of NAT10 inhibitor remodelin and CTLA-4 antibody synergistically activates T cells.\",\n      \"method\": \"NAT10 KO/overexpression, ac4C sequencing, ChIP/reporter for JunB-driven LDHA, in vitro and in vivo tumor models, T cell functional assays\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ac4C sequencing, ChIP, in vivo xenograft; single lab\",\n      \"pmids\": [\"39363363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MEK inhibition prevents CAR-T cell exhaustion and terminal differentiation by downregulating c-Fos and JunB. Overexpression of JunB in CAR-T cells counteracts MEK inhibition effects. Cut-and-Tag assay shows that MEK inhibition reduces JunB-driven gene programs associated with exhaustion, differentiation, anergy, glycolysis, and apoptosis in CAR-T cells.\",\n      \"method\": \"MEKi treatment, JunB/c-Fos overexpression in CAR-T cells, Cut-and-Tag (JunB ChIP-seq), single-cell transcriptomics, tumor efficacy assays\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Cut-and-Tag for JunB genome-wide binding, rescue by JunB overexpression; single lab\",\n      \"pmids\": [\"39438476\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"JunB is an AP-1 transcription factor that dimerizes (as homodimers or heterodimers with Fos/Jun/ATF family members) with intrinsically lower DNA-binding affinity than c-Jun due to specific leucine zipper and DNA-binding domain residues; it directly activates or represses target genes including p16(INK4a), cyclin A, cyclin E1, G-CSF, IFN-γ, IL-4, MMP-2, Myl9, FBXO21, and DDX11, and is itself regulated post-translationally by phosphorylation (JNK at Thr102/104; GSK3 phospho-degron), ubiquitination/degradation (SCF-FBXW7, Smurf1), deubiquitination (USP38), neddylation (Itch), and m6A-dependent mRNA stability (METTL3), collectively controlling cell proliferation, senescence, muscle mass, T helper cell fate (Th2/Th17/Treg), vascular contractility and angiogenesis, osteoblast/osteoclast activity, and inflammatory responses.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"JUNB is an AP-1 transcription factor that controls cell proliferation, senescence, and lineage-specific gene programs by binding AP-1 and AP-1-like elements as homodimers or heterodimers with Fos, Jun, and ATF/BATF family members [#0, #1]. Relative to c-Jun, JunB has roughly 10-fold lower DNA-binding activity, attributable to a small number of residues in its DNA-binding and leucine-zipper domains; two destabilizing glycines in its zipper favor inactive heterodimers with c-Jun, so JunB can attenuate c-Jun-driven transcription [#0]. It enforces cell-cycle and senescence control by directly activating the CDK inhibitor p16(INK4a) to trigger premature senescence [#4], yet also driving proliferation through direct activation of cyclin A and cyclin E1, with loss causing S-phase accumulation and impaired CDK activity [#7, #28]; this proliferative/senescence balance underlies its tumor-suppressive role in prostate epithelium and its senescence-driven depletion of skin stem cell niches [#19, #25]. A GSK3-primed phospho-degron targets JunB for SCF(FBXW7)-mediated degradation in G2, and disrupting this axis causes premature sister-chromatid separation via repression of the helicase DDX11 [#15]. JunB is a master regulator of adaptive and innate immunity, directing T helper fate by activating IL-4 with c-Maf in Th2 cells [#2], specifying Th17 identity through BATF heterodimerization and activation of RORγt/RORα while repressing Foxp3 [#21], supporting Treg effector programs via IRF4 [#22, #32], and protecting T cells from apoptosis by promoting IRF4 occupancy at Bcl2l11 [#33]. It is essential for vascular and developmental processes, with knockout embryos dying from defective placental vascularization [#3], and directly activating Myl9 to control actomyosin contractility [#12]. JunB additionally governs muscle mass by blocking FoxO3-driven atrogene transcription [#13], and acts in TGF-β/Smad signaling both as a feedback repressor of Smad3 and as a driver of EMT and invasion [#5, #16, #24]. Its abundance is set by an extensive post-translational and post-transcriptional network including ubiquitination by Smurf1, neddylation by Itch, deubiquitination by USP38, and m6A/ac4C-dependent mRNA regulation by METTL3 and NAT10 [#14, #20, #23, #29, #37].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established the molecular basis for JunB's weak transactivation relative to c-Jun, explaining how it can act as a dampener of AP-1 activity.\",\n      \"evidence\": \"Domain-swap mutagenesis, transactivation reporter, and dimerization analysis defining DNA-binding and leucine-zipper residue differences\",\n      \"pmids\": [\"8383624\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which endogenous heterodimer partners predominate in specific cell types\", \"Structural basis of zipper destabilization not solved at atomic resolution\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Identified JunB as an inducible AP-1 component of the NFAT-1 complex in activated T cells, linking it to T-cell transcriptional programs.\",\n      \"evidence\": \"EMSA supershift with AP-1-specific antibodies, AP-1 site mutation, reporter assay\",\n      \"pmids\": [\"8441422\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish downstream T-cell genes controlled by this complex\", \"Functional consequence of JunB/Fra-1 versus other dimers at NFAT sites unaddressed\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined JunB as a Th2-selective activator of IL-4 acting cooperatively with c-Maf, and tied this to JNK phosphorylation of JunB.\",\n      \"evidence\": \"EMSA, reporter assay, Thr102/104 phospho-mutagenesis, JNK kinase assay, transgenic overexpression\",\n      \"pmids\": [\"9889198\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the structural mechanism by which phosphorylation enables cooperative DNA binding\", \"Other Th2 target genes not enumerated\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrated that JunB is essential for placental and embryonic vascularization, defining trophoblast target genes through which it acts.\",\n      \"evidence\": \"junB-null mice, trophoblast gene expression analysis, tetraploid blastocyst rescue\",\n      \"pmids\": [\"10022836\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect regulation of proliferin/MMP-9/uPA/flt-1 not fully resolved\", \"Cell-autonomous mechanism in each vascular cell type undefined\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showed JunB directly activates p16(INK4a) to induce senescence, establishing it as an anti-proliferative AP-1 factor.\",\n      \"evidence\": \"Gain/loss of function in fibroblasts, p16 promoter reporter/deletion, cyclin D kinase assay, INK4a-null epistasis\",\n      \"pmids\": [\"10856241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the same factor toggles between senescence and proliferation outputs not mechanistically resolved here\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved the in vivo specificity of JunB by showing it can substitute for c-Jun at Jun/Fos but not Jun/ATF target genes.\",\n      \"evidence\": \"Jun-locus knock-in, transgenic complementation, target-class gene expression\",\n      \"pmids\": [\"11818961\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for selective rescue of Jun/Fos versus Jun/ATF targets not pinned to specific residues\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Established a pro-proliferative arm of JunB via direct activation of cyclin A at a CRE element, driving G2/M progression.\",\n      \"evidence\": \"junB-null fibroblasts, cyclin A CRE promoter reporter, CDK assays, inducible JunB rescue\",\n      \"pmids\": [\"12121977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation with JunB's senescence-promoting role left open\", \"Context determining activation versus repression of cell-cycle genes undefined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Revealed cell-autonomous roles of JunB in both osteoblasts and osteoclasts, linking it to bone homeostasis.\",\n      \"evidence\": \"Lineage-specific conditional knockouts, differentiation assays, gene expression analysis\",\n      \"pmids\": [\"14769860\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct target genes in osteoclast lineage not defined\", \"Mechanism of opposing effects in two lineages unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified phosphorylation-dependent coactivator recruitment, showing Ser-79 phosphorylation enables JunB-p300 cooperation at the DMP1 promoter.\",\n      \"evidence\": \"Co-IP, ChIP, Ser-79 phospho-mutant, DMP1 reporter\",\n      \"pmids\": [\"15308641\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Kinase responsible for Ser-79 phosphorylation not identified\", \"Single lab; reciprocal validation of p300 interaction limited\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Placed JunB in a TGF-β negative feedback loop by showing it binds Smad3 off-DNA to limit Smad-driven transcription.\",\n      \"evidence\": \"Smad3-JunB co-IP, reporter assays in junB-null versus WT MEFs with rescue\",\n      \"pmids\": [\"11402315\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; reciprocal/structural validation of the Smad3 interaction lacking\", \"Later work shows context-dependent pro-EMT role, leaving the dual function partly unreconciled\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed dimer-composition switching (JunB homodimer to JunB/FosB) at the MMP-2 promoter drives oxidant-stress-induced transcription during cardiac I/R injury.\",\n      \"evidence\": \"ChIP of endogenous MMP-2 AP-1 site, IHC, qPCR, radical-scavenger inhibition\",\n      \"pmids\": [\"16699069\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; functional consequence of dimer switch on cardiac outcome correlative\", \"Signal linking oxidant stress to FosB induction not defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated dual transcriptional and translational control of JUNB downstream of NPM-ALK via ERK and mTOR in ALCL.\",\n      \"evidence\": \"NPM-ALK expression, ERK/mTOR inhibition, knockdown, polysome fractionation\",\n      \"pmids\": [\"17690253\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct ERK/mTOR effectors on the JUNB locus/mRNA not identified\", \"Generalizability beyond ALCL untested here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined JunB as a direct repressor of G-CSF in keratinocytes mediating skin-to-bone-marrow signaling, with genetic epistasis confirming the target.\",\n      \"evidence\": \"Epidermal-specific conditional KO, G-CSF double-mutant rescue, promoter studies\",\n      \"pmids\": [\"18641637\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Bone loss phenotype is G-CSF-independent, leaving its mediator undefined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Myl9 as a direct JunB target controlling actomyosin contractility, motility, and arterial function.\",\n      \"evidence\": \"Conditional KO in vascular cells, Myl9 rescue, contractility/stress-fiber assays, ChIP\",\n      \"pmids\": [\"20551518\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Additional cytoskeletal targets not mapped genome-wide here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established JunB as a regulator of muscle mass that opposes FoxO3-driven atrogene transcription independently of Akt/mTOR.\",\n      \"evidence\": \"In vivo muscle electroporation OE/KD, ChIP of FoxO3 at atrogin-1/MuRF-1, protein synthesis, denervation model\",\n      \"pmids\": [\"20921137\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which JunB blocks FoxO3 promoter binding (competition versus complex) not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Smurf1 as an E3 ligase that destabilizes JunB, coupling JunB turnover to mesenchymal proliferation and osteoblast differentiation.\",\n      \"evidence\": \"Co-IP via PY motif, ubiquitination assay, cyclin D1 reporter, knockdown rescue in Smurf1-null cells\",\n      \"pmids\": [\"20200942\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals controlling Smurf1-JunB engagement in vivo not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined a GSK3-FBXW7 phospho-degron controlling JunB degradation in G2 and linked its failure to chromosome cohesion defects via DDX11 repression.\",\n      \"evidence\": \"Phospho-degron mutagenesis, co-IP with GSK3/FBXW7, ubiquitylation assay, chromatid cohesion readout\",\n      \"pmids\": [\"22710716\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether JunB-DDX11 repression contributes to genomic instability in cancer not tested in vivo\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed JunB stability is controlled downstream of CARMA1 signaling, linking TCR signaling to JunB-dependent Th2 differentiation.\",\n      \"evidence\": \"CARMA1-deficient T cells, JunB ubiquitination/stability assays, Th2 differentiation\",\n      \"pmids\": [\"22371397\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; the E3 ligase acting downstream of CARMA1 not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Implicated JunB in TGF-β-induced EMT, including Smad-mediated Id2 repression via ATF3 and induction of mesenchymal/fibrotic genes.\",\n      \"evidence\": \"siRNA, JunB-ATF3 co-IP, ChIP, junction/actin imaging, reporter\",\n      \"pmids\": [\"22391036\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct versus indirect target assignment for each mesenchymal gene incomplete\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established IFN-γ (Ifng) as a direct JUNB target in NK/NKT cells driving STAT1-dependent hepatitis.\",\n      \"evidence\": \"Conditional immune KO, ChIP at Ifng promoter, cytokine ELISA, IFN-γ/IRF1 rescue\",\n      \"pmids\": [\"24200694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dimer partner controlling Ifng activation in NK/NKT cells not specified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked JunB to ER-stress survival signaling by showing it activates XBP1 via C/EBPδ to sustain AKT and suppress BAD-driven apoptosis in β-cells.\",\n      \"evidence\": \"siRNA/overexpression, BAD and AKT phosphorylation assays, C/EBPδ reporter, XBP1s rescue\",\n      \"pmids\": [\"24786832\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; directness of JunB regulation of the XBP1 axis not fully resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed JunB is required for both classical and alternative macrophage activation programs.\",\n      \"evidence\": \"siRNA knockdown in macrophages, LPS/IL-4 stimulation, expression profiling with network modeling\",\n      \"pmids\": [\"25472994\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct macrophage target genes not defined by ChIP\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined a tumor-suppressive role for JunB in prostate, where its loss reduces p16/p21 and senescence to cooperate with Pten loss in invasive cancer.\",\n      \"evidence\": \"Prostate-specific Junb/Pten double KO, histology, senescence/proliferation immunostaining\",\n      \"pmids\": [\"25526087\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; mechanism of stromal osteopontin/S100A8/9 induction not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established JunB as essential for Th17 identity through BATF heterodimerization, RORγt/RORα activation, and Foxp3 repression, with replication across labs.\",\n      \"evidence\": \"Conditional Junb T cells, ATAC-seq/ChIP-seq of BATF at Rorc, RNA-seq, EAE/colitis models\",\n      \"pmids\": [\"28824171\", \"28555647\", \"29234109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Distinction between pathogenic versus non-pathogenic Th17 control only partly mechanistically explained\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed JunB enables effector Treg programs by facilitating IRF4 chromatin occupancy at Icos/Ctla4 loci, preventing autoimmunity.\",\n      \"evidence\": \"Treg-specific KO, IRF4 ChIP-seq with/without JunB, flow cytometry\",\n      \"pmids\": [\"30559442\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"BATF-independent arm of JunB action not mechanistically defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified USP38 as a deubiquitinase stabilizing JunB downstream of TCR signaling to support Th2 development.\",\n      \"evidence\": \"USP38-JunB co-IP, K48-specific deubiquitination assay, USP38 KO mice, asthma models\",\n      \"pmids\": [\"30224386\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Counteracting E3 ligase for TCR-induced JunB turnover not identified here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed JUNB in a TGF-β feed-forward network driving late invasion genes WNT7A/7B in breast cancer.\",\n      \"evidence\": \"SMAD2/3 ChIP-seq, JUNB knockdown, motif analysis, invasion assays, WNT manipulation\",\n      \"pmids\": [\"29186616\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct JUNB binding at WNT7A/7B loci not fully established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated JunB is required for Treg development by enabling IL-2 production and CD25 expression, with a cell-intrinsic defect rescuable by IL-2.\",\n      \"evidence\": \"Cd4-Cre conditional KO, in vitro Treg ±IL-2, mixed bone marrow chimera, IL-2 complex rescue, DSS colitis\",\n      \"pmids\": [\"31285535\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct target through which JunB controls IL-2/CD25 not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed persistent JunB drives fibroblast senescence (p16 up, IGF-1 down) that depletes skin stem cell niches.\",\n      \"evidence\": \"Fibroblast-specific OE/silencing in vivo, p16/IGF-1 analysis, stem cell quantification\",\n      \"pmids\": [\"34469740\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; directness of IGF-1 repression by JunB not fully established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined a JUNB-FBXO21-ERK axis in chondrocytes that inhibits autophagy and promotes osteoarthritic cartilage degeneration.\",\n      \"evidence\": \"ChIP of JunB at FBXO21 promoter, FBXO21-ERK co-IP/MS, siRNA, OA model\",\n      \"pmids\": [\"33450132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; mechanism by which FBXO21 phosphorylates ERK requires deeper validation\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified JUNB as essential for hemogenic endothelium specialization and endothelial-to-hematopoietic transition in human hematopoiesis.\",\n      \"evidence\": \"ATAC-seq, H3K4me3/H3K27me3 ChIP-seq, RNA-seq, single-cell analysis with JUNB loss-of-function\",\n      \"pmids\": [\"35668082\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct JUNB target genes driving the transition not pinpointed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed JUNB promotes cell-cycle progression via cyclin E1 induction and switches TGF-β2 from anti-proliferative to pro-invasive output.\",\n      \"evidence\": \"Transcriptomics, ChIP-seq, cyclin E1 reporter, polysome profiling, xenograft/metastasis\",\n      \"pmids\": [\"36494864\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; threshold mechanism for the TGF-β2 response switch undefined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established m6A control of JUNB mRNA stability by METTL3 and 3'UTR reader proteins during TGF-β-induced EMT.\",\n      \"evidence\": \"METTL3 KD, 3'UTR m6A site mutagenesis, reader knockdown, RNA stability assays\",\n      \"pmids\": [\"36183833\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; identity and division of labor among readers only partly resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed JunB protects T helper cells from apoptosis by promoting IRF4 binding at Bcl2l11 and is required for clonal expansion.\",\n      \"evidence\": \"Conditional KO, apoptosis/proliferation flow cytometry, IRF4 ChIP at Bcl2l11, immunization\",\n      \"pmids\": [\"35837408\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; how JunB enhances IRF4 occupancy mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked the circadian clock to JunB by showing Bmal1 directly drives Junb transcription to gate diurnal macrophage inflammation.\",\n      \"evidence\": \"Myeloid Bmal1/Junb conditional KO/KD, Bmal1 ChIP at Junb promoter, AKT/ERK assays, ConA hepatitis\",\n      \"pmids\": [\"37791375\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct macrophage targets of JunB in this circuit undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a VCAM-1-JunB-IL-8/CXCL1 axis controlling retinal endothelial sprouting and pathological neovascularization.\",\n      \"evidence\": \"siRNA, IL-8 promoter reporter, RNA-seq, intravitreal siRNA, OIR model\",\n      \"pmids\": [\"37179352\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; signaling connecting VCAM-1 to JunB activation not detailed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed NAT10-mediated ac4C of JUNB mRNA elevates JunB, which activates LDHA to promote glycolysis and immunosuppression in TNBC.\",\n      \"evidence\": \"NAT10 KO/OE, ac4C-seq, ChIP/reporter for LDHA, in vivo tumor models, T-cell assays\",\n      \"pmids\": [\"39363363\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; relative contribution of ac4C versus other JunB regulation in TNBC unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated that MEK-driven JunB programs promote CAR-T exhaustion, and that JunB overexpression reverses the protective effect of MEK inhibition.\",\n      \"evidence\": \"MEKi, JunB/c-Fos overexpression, JunB Cut-and-Tag, single-cell transcriptomics, tumor efficacy\",\n      \"pmids\": [\"39438476\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; specific exhaustion target genes mediating the effect not isolated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How JunB's dimer partner identity and post-translational state are integrated to dictate its opposing outputs (proliferation versus senescence, activation versus repression, pro- versus anti-inflammatory) within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking dimer composition, phosphorylation, and degradation to context-specific gene selection\", \"Structural basis of partner-dependent target choice not solved\", \"Genome-wide direct target maps across cell types not integrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 4, 7, 11, 12, 13, 17, 21, 28]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 2, 4, 7]},\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [4, 7, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 13]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 4, 7, 11, 17, 21]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2, 17, 21, 22, 32, 33]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 7, 15, 28]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 16, 24, 31, 35]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [4, 25, 31]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [14, 15, 20, 23]}\n    ],\n    \"complexes\": [\"AP-1 transcription factor\"],\n    \"partners\": [\"FOS\", \"JUN\", \"MAF\", \"BATF\", \"ATF3\", \"SMAD3\", \"IRF4\", \"EP300\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}